/Engine/Source/Runtime/SlateCore/Public/Debugging/SlateDebugging.h
Called just before a widget paints.
typedef TMulticastDelegate_SixParams< void, const [SWidget](API\Runtime\SlateCore\Widgets\SWidget) *, const [FPaintArgs](API\Runtime\SlateCore\Types\FPaintArgs) &, const [FGeometry](API\Runtime\SlateCore\Layout\FGeometry) &, const [FSlateRect](API\Runtime\SlateCore\Layout\FSlateRect) &, const [FSlateWindowElementList](API\Runtime\SlateCore\Rendering\FSlateWindowElementList) &, int32 > FBeginWidgetPaint